The device contains 30 diodes emitting infrared light at 956 nm and also 80 diodes emitting red light at 637 nm. Infrared and red pulsed monochromatic light are used in a unique triple-stepped sequence. Infrared light, with an irradiance of ~55 W/m2, is combined with red light, with an irradiance of ~21 W/m2. Using a duty cycle of 80%, both infrared and red light are pulsed at the following frequencies during the first week: infrared/red 78 Hz, infrared/red 702 Hz, infrared/red 8572,2Hz and from the second week: infrared/red 15,6 Hz, infrared/red 287 Hz, infrared/red124 Hz. The choice of pulse frequencies and wavelengths are based on earlier observations in both in-vitro and in-vivo studies. The equipment for both monochromatic phototherapy and placebo (no irradiance output from the diodes) is identical in appearance.